The Spaniard reportedly had the option of joining Tottenham or Liverpool but was uninterested.
The player has a 36 million euro release clause in his Athletic Bilbao contract.
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Summer 2016 is set to be a very exciting time for football fans, as this is when the long awaited Euro 2016 tournament kicks off.
Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.